package com.travelDevelop.service;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;

/**
 * @author LPkun
 * @version 创建时间：2019年12月18日 上午11:24:38
 */
public class LoginCheckService {


	private int w = 70;
	private int h = 35;
	private Random r = new Random();
	// {"宋体", "华文楷体", "黑体", "华文新魏", "华文隶书", "微软雅黑", "楷体_GB2312"}
	private String[] fontNames  = {"宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312"};
	private String codes  = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";
	private Color bgColor  = new Color(205, 206, 192);
	public String text ;

	private Color randomColor () {
		int red = r.nextInt(150);
		int green = r.nextInt(150);
		int blue = r.nextInt(150);
		return new Color(red, green, blue);
	}

	private Font randomFont () {
		int index = r.nextInt(fontNames.length);
		String fontName = fontNames[index];
		int style = r.nextInt(4);
		int size = r.nextInt(5) + 24; 
		return new Font(fontName, style, size);//指定字体名称、样式和点大小，创建一个新 Font。
	}
	//画干扰的线条
	private void drawLine (BufferedImage image) {
		int num  = 3;//画三条
		Graphics2D g2 = (Graphics2D)image.getGraphics();
		for(int i = 0; i < num; i++) {
			int x1 = r.nextInt(w);
			int y1 = r.nextInt(h);
			int x2 = r.nextInt(w);
			int y2 = r.nextInt(h); 
			g2.setStroke(new BasicStroke(1.5F)); 
			g2.setColor(Color.BLUE); 
			g2.drawLine(x1, y1, x2, y2);
		}
	}

	//返回随机字符
	private char randomChar () {
		int index = r.nextInt(codes.length());
		return codes.charAt(index);
	}

	private BufferedImage createImage () {
		BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); 
		Graphics2D g2 = (Graphics2D)image.getGraphics(); 
		g2.setColor(this.bgColor);
		g2.fillRect(0, 0, w, h);
		return image;
	}

	//画图
	public BufferedImage getImage () {
		BufferedImage image = createImage();
		Graphics2D g2 = (Graphics2D)image.getGraphics();
		StringBuilder sb = new StringBuilder();
		// 向图片中画4个字符
		for(int i = 0; i < 4; i++)  {
			String s = randomChar() + ""; 
			sb.append(s); 
			float x = i * 1.0F * w / 4; 
			g2.setFont(randomFont()); 
			g2.setColor(randomColor()); 
			/**
			 * 首字符的基线位于用户空间的 (x, h-5) 位置处
			 * 原点在左上角,X轴递增的方向是从左向右;Y轴是从上到下
			 * 在提供的坐标位于基线上最左边字符的情况下，可以从右到左呈现字形
			 * h-5表示y轴方向,向上偏移了5
			 */
			g2.drawString(s, x, h-5);
		}
		this.text = sb.toString().toUpperCase();
//	        drawLine(image);干扰线
		return image;
	}

	//获取验证码字符串
	public String getText () {
		return text;
	}

	public static void output (BufferedImage image, OutputStream out) 
			throws IOException {
		ImageIO.write(image, "JPEG", out);
	}



}
